I've not tried them in 28 but have tried both in 25, and despite what Michelin say I could'nt tell the difference between either the V2 Endurance or the Power Endurance, so I'd go for which ever you can find cheaper. Both these Endurance versions definitely last longer than the V2 Race and Power Race versions, which I found both cut up pretty quickly on rubbish London roads, but did feel a bit quicker. No surprise there really.
As I said I've not got the 28's, but I have heard others say Michelin 28's seem quite fat, so if your frame has really tight clearances it might be worth checking in a shop to see they definitely fit first.